Grate-bar.



PATENTED NOV. 20, 1906.

E. A. WI LDT.

GRATB BAR.

APPLICATION FILED JULY 31, 1905.

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UNITED STATES PATENT OFFICE.

GRATE-BAR.

Specification of Letters Patent.

Patented Nov. 20, 1906.

Application filed July 31, 1905. Serial No. 271,990.

To (ZZZ whom it Wmy concern:

Be it known that I, EDWARD A. WILDT, a citizen of the United States, residing at Scranton, county of Lackawanna, State of Pennsylvania, have invented certain new and useful Improvements in Grate-Bars; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to fuel-supporting devices, and particularly to that class of devices known as rocking grate-bars, although in some of its aspects the invention is equally applicable to stationary grate-bars.

l/Vhere it is desired to burn anthracite coal of very small sizes, bituminous slack coal, or coal which contains a considerable amount of fine carbonaceous particles or dust, it is necessary to provide a grate with small air-openings of such size that the fuel will not fall through. It is impracticable to cast grates having air-openings of the proper dimensions for burning very fine fuelsuch, for instance, as noted above.

It is an object of the present invention to build up each grate-bar of sections transverse to the length of the bar which are of such conformation that when assembled air-spaces are formed between them, and it is practicable to so form the grate-sections that any desired dimensions of the air-spaces may be secured.

It is a further object of the invention to provide a grate-bar which shall not be longitudinally continuous along the coal-supporting surface. The bar may then expand and contract under changes of temperature without warping the grate-bars, as would happen with a grate-bar having a continuous fuelsurface.

A further object of the invention is to provide a grate-bar built up of sections which shall resist distortion, the different sections moving together as if formed integrally.

Other objects will appear in the following description, in connection with the accompanying drawings, which illustrate an embodiment of the invention, and of which Figure 1 is a side elevation of a grate-bar. Fig. 2 illustrates in perspective separated sections of a grate-bar; and Fig. 3 is a perspective view of a grate-bar section, showing an other side.

Referring to the accompanying drawings,

it will be seen that the complete grate-bar shown comprises four different types of transverse sections A, B, C, and D. Each of the sections B comprises a body 1, from the upper end of which a fuel-support 2 extends at a proper angle to provide a suitable supportfor the fuel. In the structure which has been found best adapted to the purpose in view the body extends upward at an inclination from the vertical and the fuel-support projects laterally from one side only of the body, so that it lies in a horizontal plane, and the angle between the body and fuel-support is acute. To strengthen the section, a supporting-Web 3 may be interposed between the body and the fuel-support.

It will be observed that the widths of the fuel-supports are less throughout their length than are the bodies, so that at no point in the width of the assembled grate-bar is there a contact between the faces of the fuel-supports, with a consequent avoidance of warping of the bars under changes of temperature, as before referred to. As best shown in Figs. 2 and 8, this difference in the width of the body and the fuel-support is obtained by making the latter flush with the body on one side and by cutting away the fuel-support slightly on the other side of the body, so that that side of the support is inset from the side of the body. This is clearly indicated in Figs. 1 and 3, where it will be seen that the air-spaces 4 are formed by simply cutting away one side of each of the fuel-supporting portions of each section of the grate-bar, the other side being uncut, so that the body part and the fuel-support are flush with each other on that side of the section. The differences in width between the section-bodies and the fuel-supports determines the width of the airopenings 4.

The sections when assembled are prevented from relatively turning by any suitable means, as forming upon opposite sides of the section-bodies ribs 5 and grooves 6, adapted, respectively, to enter a groove in and receive a rib from an adjacent section. The ribs and grooves extend longitudinally of the bodies in the structure illustrated and are found to form a peculiarly efficient means of preventing the sections from turning with relation to each other, as the length of rib thus obtained reduces the intensity of strain at any one point, and, moreover, the bodies of the sections are held throughout their lengths.

lIO

Each of the sections is provided with a hole, as '7, which registers with similar holes in the other sections of the grate-bar, so that a rod 8 may be passed through the holes and the sections clamped together by a head 9 at one end of the rod and grate-bar and a nut 10 at the other end. The description thus far applies also to the end sections A and D, except that these sections are preferably wider than the sections B, so that without unduly impairing their strength they may be pro vided on their outer sides with countersinks 17 to receive the head and nut of the clamping-rod, and there being no sections upon one side with which the end sections can engage a rib or groove, as the case may be, is omitted from each.

A complete grate-bar having superior advantages has now been described; but it is preferred to supply a supporting-bar 11 which passes through holes 12 in the sections and on which the sections may turn in case a rocking bar is desired. In order to facilitate the rocking of the grate-bar, certain of the sections C may be provided with sh akinglugs 13, and to facilitate the connection. of the operating apparatus a hole 14 may be formed in the lug; otherwise the section C is like a section B. To increase the strength and rigidity of the grate-bar, a plurality of clamping-rods is preferably provided, and to this end an additional clamping-rod 15, similar to rod 8, maybe furnished, and registering holes 16 are formed in the sections for its passage. and 15 are located upon opposite sides of the supporting-bar 11.

Preferably the clamping-rods 8 While I have illustrated the invention in what is considered its best form, it is to be understood that it may be embodied in other structures and should not, therefore, be limited to that shown. 7

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent, is

1. A grate-bar, comprising a plurality of transverse interlocking sections, each section having an upstanding body part and a fuel support projecting horizontally therefrom, said fuel-supports being narrower than the body portions so as to leave shallow airspace between the supports, and a tie-rod passing through the body portions of the sections and tying them together.

2. A grate-bar, comprising a plurality of transverse interlocking sections, each section having an upstanding body part and a fue1- support projecting horizontally therefrom, said fuel-supports being narrower than the body parts of the sections so as to leave shallow air-spaces between the supports, and tierods passing through the body parts of the sections and tying them together, the outer sections being wider than the intermediate sections, and provided on their outer sides with countersinks 17 to receive the heads and nuts of the tie-rods.

In testimony whereof I affix mysign ature in presence of two witnesses.

EDWARD A. WILDT.

Witnesses;

MORGAN SWEENEY, HARRY R. KINGSBURY. 

